Pay-station telephone system.



F. LUBBERF' PAY STATION [TELEPHONE SYSTEM. APPLICATION FILED OCT. 18. 1905' RENEWEUSEPT. I2. 1913.

Patented June 6, 1916.

5 SHEETS-SHEET I.

W /Zf r. LUBBERGER.

PAY STATION TELEPHONE SYSTEM. APPLICATION FILED 061318.490. RENEWED'SEPT. 12. 1913.

1,186,484. lw'wuima June 6,1916.

5 SHEETS-SHEET 2- F. LUBBERGER.

PAY STATf0N TELEPHONE SYSTEM. APPLICATION FILED OCT-18.1905- RENEWED SEPT. 12, 1913, 1,186,484

5 SHEETSSHEET 3- Patented June 6, 1916.

F. LUBBERGER.

PAY STATION TELEPHONE SYSTEM. APPLICATION FILED 0121.10. 1900. RENEWED SEPT. 12. ma.

1 ,1 86,484. Patented June 6, 1916.

5 SHEETS-SHEET 4- 14410111014141" II" I lllllllllllllldllAIlulllllllllll GER.

PAY STAT0N TELEPHONE SYSTEM.

APPLICATION FILED 06118, $905. RENEWED SEPT. 12, I913.

6,1916. 5 SHEETS-SHEET 5.

Patented J une 15 :65 yea, WM

onrrnn srarns PATENT. OFFICE.

FRITZ LUBBERGER, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO i FIRST TRUST AND SAVINGS BANK, TRUSTEE, OF CHICAGO, ILLINOIS.

PAY-STATION TELEPI-IQN E SYSTEM.

Patented June 6, 1916.

Application filed October 1a, 1906, Serial no. 889,512. Renewed September 12, 1913. Serial No. 789,546.

Y '0 (:U Whom it may concern:

' in the controlling mechanism thereof.

Generally stated the object of my invention is the provision of an improved and h ighl y eilicient pay-station telephone exchange system.

Special objects are the provision of means whereby a. calling subscriber renders his talking circuit inoperative, and whereby said circuit remains inoperative until after the called subscriber answers, and until the calling subscriber then deposits a coin in the controlling mechanism; the provision of means whereby a calling subscriber may call the trouble operator without being compelled to deposit a coin in the slot of the mecha- 1 nism containing the controlling mechanism; the provision of means whereby if a calling 'subscribercalls a busy line andgets a busy-signal. he may then upon hanging 1 up his receiver restore the telephone-apparatus to normal. condition. leaving the same in readiness to receive a call; and the provision of ccrtaindetails, combinations and featurcs of inmrovement tending to increase the general eiiiciency and serviceability of a telephoneexchange system of this particular character.

To the foregoing and other useful ends, my invention consists in the matters herein-.

after set forth and claimed. 1

In the accompanying drawings, Figure 1 shows diagrammatically 'a callingsubstw 1 tion and a called substation of my improved type connected with a'central office. 'Fig. 2

" is a front elevation of'a pay-station attach ment embodying the principles of my invention. Fig. 3 is a left-hand sectionalel'eva-. tron of the said attachment.

right-hand sectional elevation of the said Fig. 4 is a attachment. Fig. 5 is 'a detailed section showing certain parts in' a normal position. Fig. 6 is a perspective view oftne frame to which the magnets and switching parts of the device are attached. Fig. 7 is a front elevation of the conduit through which the coin travels. Fig. 8 is a top view of the same section. Fig. 9 is a bottom view of the same section. Figs. 10, 11, 12, 13 and 14 are detail views of the said device.

, At the substation #500 the locking relay 2 and the releasing relay 3 of the coin-col lecting device F are shown. lhe armature 4 of the said locking relay is normally unlocked, as shown at the substation #220, but when the relay 2 isenergized said armature is attracted, as shown at the left in Fig. 1, and locked by the locking armature 5, which latter is pressed to the right by the spring 6. .l/Vhen the relay armature 4 is locked the springs 7, 8 and 9 which it controls are forced together. The springs 7 and 8 when together short circuit the sec: ondary Winding 10 of the induction-coil 11, and the closure of springs 7 and9 shunts the receiver 12 through the resistance-coil 13; Being locked, the armature 4 may be unlocked by the falling of a coin 14, which latter in its do'wnwardcourse presses the stock 15 of the locking armature or latch 5 to the right, driving theangled terminal 16 to the left, permitting the armature 4 to resume its normal position, due to the tension of the spring 7. Said armature 4 may also be unlocked by the release relay 3. Said relay has two windings 17 and 18, the latter included in the subscribers switch release circuit, whereby the said release relay 3 may be energized when the subscriber hangs up .his receiver; and the former (17) in series with the line, to be energized whenever the operator at E answers. a

In the central office the calling substation #500 has allotted to it the first-selector A.

It will be noticed that the central battery B has its positive terminal prefeiably grounded. The operating relays of the central switches are'normally connected to the non-grounded terminal of the said battery,

so that the subscriber by grounding his line\ conductors may operate the saidswitches, 5. as is usually the custom in systems of the class in connection with which I have elected to illustrate my-inyention. In addition to the said first-selectbr'there is shown at'the central office a connector C, and another first-selector D .allotted to the called line.

The cord circuit E of the trouble operator is also shown just above the connectorswitch.

The co1n-collect1ng device comprised in my invention'may be considered as an at- ""tachment with. suitable terminals which anysuitable or approved type.

station #500, for instance, is provided with; the usual talking circuits, switch-hook fork.

may be electricall connected with the circuits of the telep lone proper. p

I The substations in the -system may be of The subcontrollin said circuits, and with a calling and signs. ing device. The switch-hook 19 ie prov ded with a number of cam arms 20,

21, 22 and 23 for controlling the circuits. The cam arm 22 normally engages the ringer circuit spring'24, which circuit includes the ringer'i 125, f-Sllld. ringer being normally Lbridgedacross the subscribers line; The

can! arm 21 normally controls the ground springs 26 and 27 for putting the subscribers calling device in connection with the ground'terminal G of the battery B. Also, the cam arm 20,,when-the switch-hook is up, controls the local ci rcuit springs 28 and The release sprihgs 30, Ell-and 32 are -controlled by the cam arm 23, for releasing the switching apparatus at the control ofiice,

as well as for energizing the release magnet -3 of the coin-collecting attachment. -In thev local circuit there are, of course, included the transmitter 33, the local battery 34, and

primary winding 35 of the induction-coil ll]... In the secondary circuit that comthe receiver 12 and the secondary winding 10 there is included a condenser 36. for keeping the subscribers line condoctors open.

The subscribers calling device may be of any suitable type. I have represented said calling device as comprising a couple of push-buttons 37 and 38, and a couple of springs 39 and 40 that normally engage the contact points 41 and 42,respectively. Said s rings 39 and 40 are-adapted'to be sepnidlifilil from their engaging contact points and thrust agalnst a ground post 43. Said ground post (when. the ground springs 26 and 27 close into contact) is connected with ground G through the winding of the coil Theselector A may also be of any suitable type, such as that disclosed in United States Letters Patent No. 815,321. As shown in Fig. 1 it comprises. the'line relays and 72, the rotary magnet .98, private magnet 7 3, release magnet 230, back-release relay 226, and the bridge-cutoff relay that controls the bridge-cut-ollrclay springs 58, 59 and 79. Likewise, theconnector C may be of the type disclosed in United States '-.-L ettcrs Patent No. 815,176, and, as shown,

comprises the linerelays and'138, the vertical magnet 129, the rotary. magnet 143,

the private magnet 141, theringer relay 161 the release magnet 114, and the backbridge relays 115 and 116. If the subscriber #500 wishes to make a call he proceeds as followsrlfhe desires to call the substation #220 he removes his receiver from the switch-hook, operates the vertical push-button 37 twice and the rotary push-button pressed orthe 38 once, again the first button is twice and the second button" once; last time the\button 37' is pressed ten times and the 'button38 once. By pressin the button 37 twice for the firstdigit o the {desired number, the shaft of the first-selector'A is raised two steps and the switch shaft wipers 45, 46 and 47 are raised to the second level of the line and private banks.

The operation is as follows: When the spring {39- engages'the ground 0st 43 an energizing circult is established t rough the vertical line relay50 of the first-selector A, and in series with the winding of the locking relay The current in this circuit flows from ground G through the winding of the said locking relay 2 to the conductor 51, and through the ground spring! 27 and 26 to the conductor 52, to the ground post 43 and spring 39 to the-vertical line conductor' 53, side switch wiper 54, contact point 55, vertical line relay 50, bridge-cut off relay springs 58 and59 to the battery lead 60, and through .batterv B to ground- G. By the first impulse'the locking magnet 2 1s energized, together with the vertical ,line relay 50; said locking magnet then attracts its armature 4 and permits the spring 6 to force the angled section 16 over the armature 4, thereby locking said magnet.

It will beundcrstood that the said angled section 16 normally rests against the lefthand terminal of the armature 4, as shown at substation #220. As soon as the springs 7 and 8 are forced into contact, as previously stated, the secondary WiDdingJO of the induction-coil 11 is short circuited. i],

the coil 13 and to the spring 9, theme; through the spring 8 to the spring 7. Each time that the vertical line relay 50 is energized its armature 61 presses theline relay spring 62 onto the ground spring 63, east-- gizing the yertical magnet 64. The circuit through which the current flows for energizin said vertical magnet may be followe by commencmgwlth ground G and incense passing through thexsprings and 62 to the private springs 66 and 67, through the vertical magnet 64- to the battery lead 60,

and through battery B to ground G. Each time that the vertical magnet 54; is energized the vertical armature (not I attracted, and by means of the YQI'LI i2. 1 the shaft is raised, previously suated. When the subscriber presses the spring 40 onto the ground post 43 the roc line relay 72 of the first-selectorA is in turn energized; Said relay closes a circuitihrough the private magnet 73 as a res'uit, and the latter then permits the side switch to p from first to secondposition. The circuit that comprises the said rotary iine reiay 72 may be traced as follows. from ground. i through the relay 2 to the ground post 4-3, as before, thence to the spring- 40, rotary line conductor 7-1, side switch wiper 7 5, contact point 76 to the rotary iine relay 72, through the hridge-cut-oif relay springs 79, 58 and 59 to the battery lead thence through battery B to ground G.

Having once been energized the ionizing relay 2 at the coin-collecting device is not further operated for the time being. The rotary line relay, 7 2, however, upon attract ing' its armature 80 presses the line relay spring 81 onto the ground spring Giiior operating the private magnet 73. The cur- -rent for said private magnet passes from ground G through the springs 63 3 and 81,

and through the private magnet 73 to 'the battery lead 60, thence through battery to ground G. The private magnet upon operating releases the side switch from first to second position. When the side switch shifts to second position the side switch wipers 5% and 7 5 leave the contact points and 76'and pass into engagement with the. contactpoints 91 and 92; also, the side switch wipers 93 and 94 leave the contact points 95 and 95 and pass into engagement with the contact points 97 and '98 instead.

The closure of connection between the con- .tact point 97 and side switch wiper 93 completes a circuit through the rotary magnet 98?. .The current in this circuit passes from ground G to the contact point 97, thence N through the side switch wiper 93 to the rothe, side'switch passes to third position.

Of course, if the private wiper 4:? strikes a grounded private bank contact the shaft will not-stop when the wipers reach the first contact of the secondievel, hut wili he carlric'donto the second contact, and so on, as disclosed in the patcnt'citcd above. if the private Wiper meets a grounded contact.

point the private magnet 73 is retained energized even after the rotary armature 113 returns to normal position. As a result the side switch is not permitted to pass to third position, but is locked by the private inagin thesecond position until the rotary magnet is again energized, so that the shaft and wipers may be rotated into the next position, and so on until. a non-guarded private hank contact is found. Assuming that the shaft Wi,ers are stopped on the first -conotact oi? the second ievel of the line hank irom which lead the trunk conductors 121 trunk-release conductor 123 that leads to the connector C, as shown. in Fig. 1. ivVhen the SidQmfiYVltCh passes to third position, and.

when the side switch wiper 94; engages the contacupoint 124-, a guarding .pr 'ential is estahiishcn at the first contact of the second ievel of the private bank, by way of the private wiper i7, from ground G to prevent any other selector from coming in on the seized line. The suhserihers conductors are thus extended to the connector. Vvhen the vertical button 37 is pressedtwice for the second digit of the nun'ioer desired, the vertical line relay 125 of the conductor C is energized. Current for energizing said relay passes from ground G as in the previous case, to the ground post 43, thence to the vertical line conductor 53, sideswitch wiper 54;, contact point 119, conductor 126 to the vertical line wiper 4-5, thence to the vertical trunk conductor 121 and through the vertical linc'rclay 125 to the battery load (30, thence through battery B to ground G. The vertical line relay then causes the line-relay spring 127 to press against the ground spring 128 so thatthe vertical. magnet129 is energized by a] flow of current from ground G through said springs 12S and 127 and through the private springs 130 and 131 to the side switch wiper 132, contact point 133 to the vertical magnet 129, thence to the battery lead 60 and through battery 13 toground G. The vertical magnet 129 u pon energizing twice attracts its armature and raises the shaft {not shown) two steps, placing the line and private wipers 145, 1&6

and 14:7 opposite the first contact of the sec 0nd level of their respecti'ye banks. ,4

I i l/Then the rotary button '38 is pressed for the second time the connector rotary line relay 138 is magnetized in turn aiidthe current flows from ground G to the ground post43, thence through the spring 40, con- .ductorfl i, side switch wiper 75, contact point 120, conductor 139 and rotary line against the ground spring 128; As a result.

wiper 46 to the rotary trunk conductor 122,. and through the rotary line relay'138 to the battery lead 60 thence through battery B to ground G. Upon being energized the saidrelay 138 presses the line-relay spring 140 position,-so that the side switch wiper 132 is shifted from the contact point 133 onto I the contact oint 142. When the subscriber presses the utton' 37 ten times for the last.

, digit the vertical line relay 125 is then energizedfeach time as before and over the same circuit; but when the sprlngs 127 and 128 vare forced into contact the rotary magnet 143, insteadof the vertical magnet 129, is energized, since the side switch wiper 132 is now resting in engagement with the contact point'142. The energizing circuit for said rotary magnet is from ground G, as before,

thence through rotary magnet to the side switch wiper 132, the contact point 142 to the 143 to the battery lead 60, and through battery B to ground G. The rotary armature "(notshowlfl being-attracted ten times rotates the-shaft- (notshown) ten times, carrying the switcl'1 shaft wipers 145, 146 and 147 into engagement with the tenth contact of'thesecond level of the line and private banks. The. line Wipers 145 and 146 are,

therefore, placed in connection with the normal conductors 150 and 151, and the-private wiper 147 in engagement with the private normal 152. The subscriber for the last time presses the rotary button 38 and grounds the rotary lineconductor 74, thereby energizing the rotary line relay 138 over a circuit that has already been traced. The

private magnet 141 is again energized once as a result, and the-sideswitch is shifted into third position. AS a result the subscribers extended line conductors 121 and 122 arev connected with the normal conductors 150 and 151 at the instant that the side switch -Wipers 153 and 154 engage with the contact p01nts'155 and 156,.respectively. The subscriber then presses his signaling button 157 and thereby presses the spring-158 onto the contact point 159. An energizing circuit is established through the connector vertical line relay from ground G through the coil, 2, ground springs 27 and 26, contact point 159 and spring 158 to the contact point 41, thence through the spring 39 to the vertical line conductor 53, and throughthe vertical line relay 125, as before, to the tracting itsarmature forces the springs 162 and 163 away from the springs 164 and 165 tutes instead his secondary tors 170 and 172.

gizing said relay flows from ground G, as

previously. described, to; the side switch wiper 132', thence through theringer relay 161 to the battery lead tery B to ground G. Said relay upon atand into engagement with thesprings 166 and 167. As a result the ringer generator 168 is bridged across the normal conductors. and 151 and the subsci ibers bell 169 at the station #220 is then rung. The ringing current flows from the ringer generator 168 through the ringer relay sprin s 166 and 162 to the side switch wiper 154, t ence through the contact point 156 to the rotary line Wiper 146, normal conductor 151, rotar line conductor 170, ringer 169, switch-hoo 171 to the vertical line conductor 172, thence to \the vertical normal conductor 150, vertical line Wiper 145, contact point to the side switch wiper 153, ringer relay springs 163 and 167 to the ringer'generator 168. The subscriber at the substation #220 upon hearing the signal removes his receiver 173 from the switch-hook 171 and thereby disconnects the-bell 169 from across his line, but substitalking circuit com risin r the receiver 173 and a secondar win ing 1 4. This secondary circuit across the conductors and 172 may be traced from the contact point 175 to the receiver 173, thence to the secondary windin 174, through the condenser 176, signaling utton springs 177 and 178, springs 179 and 180 to the contact point 181. The said contacts 175 and 181 are, of course, directly connected to the line conductors 170 and 172, as shown. Since the locking relay I82 is in normal condition the subscriber at the station #220 will find his apparatus in condition for talking, since the springs 135, 136 and 1.37 are separated. Upon answering he will speak into his transmitter 183 and thereby induce a current in the secondary winding 174, which current will pass to the line conduc- This current, by way of the heavy line conductors shown in Fig. 1. will reach the line conductors 53 and 74 of the calling substation. The current then passes from the conductor 53 to the 6 ring 39, contact point 41, springs a 184 signaling buttonsprings 1 58 and 1&h00lr denser 36, conductor 71,-springs 8 warmductor 70 to the receiver 12, thence to the 60, and through batgas i 1 answers. The calling subscriber then drops 13 is shunted across said receiver 12 from the springs 8 and 9 to the contact point 42 it does not cut off all the current-through the all main, that the ailing can is able to hear thecalled subscriber when he a coin 14 into a suitable slot to be hereinafter described, which coin then strikes the stock 15, releasing the armature 4, as described. The springs 7, 8 and 9' at once sepa-rate,'so that the subscribers talking apparatus at the calling substation is restored The circuit from the said groundto the ver- 7 tical line conductor 53 passes through the winding 18 of the coil 3 to the release spring 32, thence through the springs 31 and 30 to the vertical line conductor 53, and from the release spring 31 the connection" is established to the rotary line conductor 74.

Both line conductors being grounded simul taneously the switching apparatus is released in a well-known mannerthat is, the

line relays 125 and 138 of the connector C are energized simultaneously over circuits that have been described, and as a result the trunk release springs 117 and 118 are brought into, contact and the release magnet 114 of the connector is energized in series with the back-release relay 226 of the selector A over the circuit established from ground Gr at the selector A to battery B. As is well known the switch-shaft of the connector 0 falls to normal position at once, and the back-release relay 226 of the selectgr A causes the energization of the release magnet 230 by pressing the back-release relay springs 228 and 229 into contact, establishing an energizing circuit through the release magnet 230 from ground G to the battery B. Of course, when the ground is removed from the line the magnets of the connector and selector are deenergized, restoring the switches. Had the called subscribcr been busy the connector C would not have established connection with the called line, but would have been released instead. As is well known, this release occurs when the called subscriber grounds the rotary line conductor 74 for the last time when, of course, the private magnet 141 of the connector C energizes", carrying the springs 148. and 149 into contact. whereby the. roleascanagnet 114 is --energized by a flow of rurrcnttrom the private wiper 147 which at the time in connection with the grounded contact, through the said springs.

148 and 149 to the release magnet 114 and to battery B, with the result that the connector switch shaft is released and the con nah it with restored to first nation.

Then when the signaling button 157 is pressed, as described, the vertical magnet 129 and not the ringer, relay 161 is ener gized. As a result the switch-shaft is raised and the switch-shaft springs 187 and 188 are closed into contact, and busy signaling current from the coil 189 is sent out over the line of the callingsubscriber through the springs 187 and 188 to the contact point 190, thence to the side switch wiper 15.4, ringer relay springs 162 and 164, condenser 191 to the rotary trunk conductor 122, firstselector rotary line wiper 46, contact point 120, side switch wiper 75, rotary line con-' ductor 74, and through the receiver 12 and coil 13 in multiple, as already described,

condenser 36 to the vertical line conductor ,53, thence to the side switch wiper54, contacti'point 119, vertical line wiper 45, and vertical trunk conductor 121 to the vertical line relay 125, thence to the battery lead 60 and to the coil 189.' The calling subscriber, upon hearing the busy-signal, instead of dropping the coin, as described, Will hang up his receiver and establish afiow ofcun rent through the winding 18 of thecoil 3,

as already described, to the vertical and rotary line conductors 53 and Y4, and thence through the vertical and rotary line relays 125 and 138 of the connector C, over circuits that are already familiar, to the battery lead 60 and through battery B to ground G. Said relay 3 upon being magnetized attracts its armature 192 which withdraws the latch 5 from. the armature 4 ermittisaid armature to be restored, as already stated and for the purpose that has already been pointed out.

If the subscriber at thesubstation #500 wishes to communicate with the central of fice he operates his calling device in accordance with the number that he wishes to call. Assuming that the number of the central operator is 0 he operates the vertical button 37 ten times and thereby raises the firstselector shaft to the tenth level. in a manner described. mix 38 once so as to operate the private magnet 73 in order that the side switch may pass to second position, and that the rotary magnet 98 may be operated as before to carry the wipers 45 and 46 into contact with the trunk conductors'193 and .194 that lead .to the cord circuit E. The subscriber then presses the signaling button 157 and thereby grounds the vertical line conductor 53,

and asa result the relay 206 is energized- He then presses the rotary butnal she will operate a key to close thevertical line wiper 45, conductor 193, relay 206, and through battery B to ground G.

.The energization of the relay 206 causes its armature to place the springs 214 and 215 in contact, thereby closing an energizing circuit through the drop 195 extending from ground G through the springs 21 1 and 215, springs 218 and 219, conductor 204 through the drop 195, thence through battery B to ground G. When the operator sees the sigsprings 216 and 196 in contact and the springs 217 and 203 in contact. As soon as the said springs close into contactan energizing circuit is established through the Winding 17 of the substation release coil 3. The current in this circuit flows from ground G through thesprings 216 and 196,

.. thence to the conductor 193, vertical wiper 45, conductor 126, contact point 119, side,

switch'wiper 54, vertical line conductor 53, spring 39, contact point 11, springs 185 and 1 84, signal button spring 158, contact point -186.t0 the Winding 17 of the coil 3, thence through the locking magnet springs 8 and 9, resistance coil 13 to the contact point 42, spring: 40, rotary line conductor 74:, side switch wiper 75, contact point 120, conductor 1 39, rotary line wiper 16, conductor 194, springs 203 and 217, coil c, and through the battery B to ground G. Upon being energ'ized the release coil 3 attracts the armature 192 and withdraws the latch 5 from the or mature 4 so that the springs 7, 8 and 9 are separated in order that the calling subscriber may be able to converse with the central oflice operator without having to de 'i'elease'coil 3, and then the operators set is posit acoin. It will be noticed that the 0perators receiver 219 with the secondary winding 220 of the induction-coil 221 and condenser 222 are connected in series with the springs 211 and 212, and when the key is thrown in the opposite direction, first the springs216 and 196 and the springs 203 and 217 .are separated to restore the substation bridged across the calling line. The circuit from the subscribers line conductors through the said receiver may be traced as follows: from the vertical line conductor 53 to the side switch wiper 54, contact point 119. conductor 126, vertical line wiper 45,

vertical trunk conductor 193, spr ngs 213' scriber hangs up his receiver he grounds the vertical and rotary'line conductors 53 and 74, as previously described, and as a result energizes the relays 206 and 205 of the cord circuit .E simultaneously. The current through the former coil passes from the-vertical line conductor 53 to the side switch wiper 54,. contact point 119, conductor 126, vertical line wiper 45, verticaltrunk conductor 193 tothe coil 206, thenie through battery B'to ground G.

ta ry line conductor 74 to the side switch wiper 75, contact point 120, conductor 139, rotary line wiper 46, rotarytrunk conductm 194 to the relay 205, thence through battcry B to ground G. and 206 being energized simultaneously they attract their armatures at the same time and thrust the springs 224 'and 225 into contact. An energizing circuit is therefore established through the back-release relay 226 of thefirst-selector A from ground G at thesaid first-selector to the side switch contact point 121, sideswitch wiper 94, back-release relay 226 to the pri vato \vipcr 47, private trunk conductor-227,

resistance-coil 227*, vsprings 225 and 224.

When 6 and through batteryB to ground G. the back-release relay 226 becomes energized the spring-$228 and 229 are pressed into contact. .As a result the release mag net 230 is magnetized by a flow of current from ground G through the said springs 228 and 229 to the release magnet 230, thence to the battery lead and through The said relays 205 batter-v 'B to ground G.'- It will be noticed I that when both relays 205 and 206 nreenergizcd simultaneously the circuit through the drop 195 is broken. and thus the operator does not receive a. false signal. \Vhen the release springs 31 and- 32 disengage the ground connection to. the ,said subscribers line conductors is broken, the relays 206 and 205 are delincrgizod as a result," and, of course, the back-release relay"226 becomes dc-magnetized', and the firstrselector A is restored.

The coin-collecting device F, shown in .Figs. 2, and 4, is constructed as fllowst ln gcncra'l appearance the coin-col acting machine resembles a small savings bank.

It comprises two parts, the circuit-contraling 1neclnmism-J and a box K beneath said circuit-controlling mechanism for receiving the come as they pass through t cont-roll 1 ug devi cc.

he circuit- The instmment as a whole is assembled on the base M andiis.

adapted to be secured to any suitable support L, a part of the telcphone,.-for instance. This basemay be of any suitable material, .with holes for admitt ng the screws 231. he n'u-chanism is protected by a. cover N which has on its under edge lugs 232 that are adapted to fit into the slots 238,

n The other relay 1S energized by clirrent flowing from the r0- held in place.

mos ics as more clearly shown in Fig. 11. 'When the cover is first put in place the terminal 234 of the lug clears the edge of the slot 233, but upon entering in position the cover N is moved in the direction of the arrow so that the edge 235 oi the slots may enter into the slots 236. lVhe-n thus driven into position the belt 237 of the lock is carried opposite an aperture 239 (Fig. 8) so that when the kev 2&0 is turned. the said bolt may enter the said aperture '23!) for locking the cover in'place. It will he understood. of course. that the lock 238 is secured to the coi'e'r N by srrews or hy any other method that may he desired. As shown in Figs. 2 and 4 there is secured at thenppcr 'lettdiand corner of the base M a short joint of conduit lit for admitting the cable that conducts the wires from the telephone proper to. the circuit-controllin; mechanism. At the upper right'iiand corner of the cover N there is a'coin-slot 2-12. shown in Figs. 2. 3. land 5, through which the money is dropped onto a ledge. to he hereinafter described, and then sent on its down;- ward course when the suhscrilwr presses the hutton 2-13. The said outtou is maintained in normal position by a spring 24% (Fig. 5). The circuit-controlling mechanism is mount ed upon a frame 0, shown in Fig. 6. On

the right-hand side this Frame is provided with a couple of threaded holes 245 and 24-6 for securing the said frame in place.

There is a. metal shelf 247, shown inl igs. 2, (B and 4-, formed by a hand bent into three sides of a square. The open side of the square is to the front. The side opposite this front is secured to the ease M by screws 248. At the under edges of this metal piece there are secured lugs 249, more clearly shown in Fi 2. This metal piece acts as a shelf or cradle into which the frameO is set. The said frame 0 is secured by screws 250 to the said metal piece or shelf 247. The screws 250 are emheddcd'iu the holes 245 and 246 so that the said frame 0 is securely The locking and releasing magnets 2 and 3 1) areset up within the frame 0 and secured thereto by screws 251 to the bottom of said frame, said screws passing through the openings. 252. The armature i of the coil 2 is, as. shown pinotally mounted upon the upright 253,?1nd the armature 192 of thelcoil 3 is pivoted upon the section 254:. There are two lugs 255 and 256 opposite the place allotted tothe magnet QRndhetween which the latch 5 is pivotally mounted. The stock 15 of said latch is shown in Fig; i projecting beyond the outer surface of the frontwall 257 of the frame 0. Normally the armature 4' and latch are in such a position with relation to each other that the end 16 rests upon the circumference of the armature 4; but there is a spring 6 which, if thearmature 4 is attractmeans of the bolt ed, carries the terminal 16 over the armature -land locks it in its attracted position. Near the base of the section 253 that supports the armature lthere are'suitable openings 260 to which the springs 7, 8 and 9 are fastened,

which springs extend upwardly in front of the downwaidly-projecting angled section 261 oi the armature l, as clearly shown in Fig. 4-. As indicated the front. and back sections 257 and are given rigidity hy The spring 7 normally rests against the armature 4 and provides suiiicient tension ,for retaining saidv the suhstatiou talking circuits in normal condition. When the release coil 3 becomes dei nere'izwd the retracting spring, 259 pro rides suiiicient tension to restore the said armature to normal position.

In connection device. there is provided a coin-selecting lill'lflS whereby when a, coin of improper size dropped into the slot the coin. will he rejected: but if a coin of proper size introduced into the machine the coin will.

pass through and produce the desired results. For instance. if the machine is 'adwith the circuit-controlling justed to receive nickel pieces. then when.

cencpicccs are dropped instead the same will run out of the machine, while the nickel pieces will pass through and operate the mechanism. The trough P through which the money .nassesis shown in Fig. 7. it attached to the frame 6 on the. front wall 257 ust opposite the latch 5.

The screws 26% are,,adauted to engage the openings 26:? in said wall for retaining the trough in position. indicated in Fig. 2. The trough proper is very simple and is made ot'two plates 255 and 267. The plate 2% as shown. is grooved. It has a main giro-ore or wool 268 that extends from the top 2% to the bottom 270. There is ahranch 271 to this groove or slot that passes to the right. and which terminates in the cup 272. Said channel 271 is provided'for ejecting" improper coins; namely. coins-that are smaller than thosefor which the machine is adjusted. The plates266 and 267 have cut through them two sections 273 and 274, that are connected hr :1 narrow slot 275. "Above 'said sections and 27. 2 there is another slot 276 which is horizontallji disposed; k sliding member 277 (Fig. 12) is adapted to engage the plates 2% and 267 through the openings 4, 275 and276 in the followmember 277 enters the horizontal slot 276 within which slot it is adapted to slide. Upon the ba'ckof the. plate 267 and right opposite the slot 27 6there is a guide 279 which is shown in top view in Fig. 8'. The right wing 280 of the member 279 is folded over to the left for guiding the right edge 281 of the member 277. Said g1'1ide279, as shown in bottom view in Fig. 9, is secured to the plate 267 by the screws 282. The left-hand side of the member 279 is turned up at right angles to the horizontal section 283 of' saigl member to form a guide 284, as shown Fig. 1. The sliding piece 277 is provided with a slot 285 that engages saidangled section 284, as shown in. Fig. 8. The section 278 that carries the slot 285 carries in addition j pin 302 is two other slots 286 and 287. The slot 286 is provided as a guide-channel that receives a screw 288, said screw being embedded in the guide member 279, as shown in Fig. 8. The front face289 of the sliding member 277 has a rearwardly-projecting pin 290. The said pin operates in the hole 291 that pierces the plates 266 and 267. The projections 292'and. 293 of the sliding member 27 7 operate respectively within the cut sections 273 and 274:, while the part 294 of the metal from which the said sections 292 and 293 project operates in the slot 275. Ofiset from the projection 292 there is a finger 295 that extends above the section 292 and that operates in the slot 296 at the upper right-handside of the opening 273. The plane of said finger 295 is at right angles to the plane of the members 293 and 294, and said finger normally rests within the channel 271, actin; as an'obstruction to prevent legitimate coins from rolling out to the cup 272. A screw 297, shown in Fig. 8, is fastened in the opening 298, shown in Fig. 12, and to this screw a retracting-spring 299 has one end attached and the other end secured to a suitable screw upon the plate 267. The ob jcet of this. rctractirig-spring to provide a means whereby. when the sliding member 277 is pressed inwardly. it (the sliding member) may be withdrawn into normal position aIItomaticallv.

The coin-sclerling mechanism operates as follows: I'lcforring to Fig. 5 it will be seen that it a coin is dropped into the slot 242 it will enter part way and rest upon the sliding member 27? (upon the face 278) at about a point marked by the line 300 (Fig. 12). 'lhehtallinpsubscriber having previnnslv made his call lathe manner that has been described. when tho'called subscriber answers drops the coin as stated andpresses the bull n "ll-3, thus adi'aming the sliding member 277 so that the linger 29.") that normally res-ls \nlh'm the channel 271 is dri en beyo ul said channel. When the said button 243 is, pressed as stated, as the finger 295 begins to leave the channel 271 the pin 290 begins to advance within the 'hole291, across the perpendicular channel 268, and atthe same" time the flanges 292 and 293 'n to travel inwardl in the slots 273 a 274, respectively. ery soon the said flanges 292 and 293 pass beyond the channel'268, and the sloping section 294 from which the said flanges project obstructs the said channel 268, as shown in Fig. 4. When the sliding member 277 reaches the inward limit. of its stroke the coin that has been resting upon the shelf 27 8 drops through the slot 287, if \it is not too large to pass through the slot -301, and passes throu hand is caught between" the pins 290 an 302 (Fig. 14). Said permanently screwed onto the back plate 267 and limits the breadth of I said channel 268, as shown-in Fig. 7. If the coin istoo small it passes between the pins 290 and 302, as shown in Fig. 13, and strikes the sloping section-294 and rolls out through the channel 271into the cup 272. If the coin is of proper size, however, it remains hanging between the pins 290 and 302, as shown in Fig. 14-, until the sliding member. 27 7 recedes sufli'ciently to permit the pill 290 to leave the channel .268, by which time also the finger 295 is again acrossthe channel 271. The coin then drops through the channel 268 behind the flanges 292 and 293 and down through said channel until it strikes the stock 15 of the latch 5. It will be noticed that the. lower end of the plate 267 is cut away at 303, so that the said stock 15 may normally rest within the ath of the coin 14, as shown in Fig. 10. en the latch 5 is operated the armature 4 regains its normal position and the calling subscriber may then converse with thecalled subscriber. The object in providing the flanges 292 and293 is as follows: Someone K may, with the intention; of defrauding the machine, drop a coin smaller than the coin required into the slot 242, and by tapping thebutton 243 catch the small coin between the slot 287 and the neck 269 (Fig. 4) then by further tapping the button 243 the sliding member 277 and the coin will be released, which sliding member upon immediately jumping forward clearsithe sloping section 294 from the channel Pwhile the coin is falling. The said flanges are provided to catch (in such an event) the coin between them and the plate 266, and thus prevent the clearing of the passage P. 'The roin will, of course, be held there until the button 243 is again pressed, at which time the coin. will. roll out of the machine to the cup 272. It will be evident that it is desirable that the flanges, and especially the flange 293, extend upwardly as high as possible and to such a distance that when the ing, each telephone line provided at its 'in-,

ner end with an individual line relayl. 5. In a telephone ,exchan c system, the

combination of a calling 'su scribers telephone line, a called telephone line, automatic means for enabling the calling sub scriber to establish connection with the called'telephone line, pay-station apparatus for preventing the calling subscriber from talking over the line until after he deposits a coin in said apparatus, a switchboard op erators equipment, and means for permit ting the calling subscriber to talk with the operator without paying, each subscribers substation provided with a pair of paystation relays.

6. In a tele hone exchange system, the

combination 0 subscribers telephone lines,

" trunk lines, automatic switches for connecting telephone lines through the medium of said trunk lines, pay-station apparatus for preventing any calling subscriber t'roin conversing with a called subscriber until after a coin is deposited in said apparatus, a

switchboard operators equipment, and

means for permitting any calling subscriber to converse with the operator without paying, each subscribe-rs substation provided with a pair of individual line relays;

7. In a telephone exchange system, the

combination of a calling subscribers telephone line, a called telephone line, automatic means for enabling the calling sub-' scriber to establish connection with the called telephone line, pay-station apparatus for preventing the calling subscriber from 40 talking over his line until after he deposits a coin in said apparatus, a switchboard operators equipment, and means for permitting the calling subscriber to talk with the operator without paying, each subscribers substation providedv with an induction-coil, and a normally open shunt or short-circuit extending said coil.

8. In a telephone exchange system, the

combination of subscribers telephone lines, trunk lines, automaticswitches for connect ing telephone lines through the medium of said trunk lines, pay-station apparatus for preventing any calling subscriber from conversing with a called subscriber until after a coin is deposited in said apparatus, a switchboard. operators equipment, means for permitting any calling subscriber to converse with the'operator without paying, each subscribers substation provided with an induction-coil, and a normally open shunt or short-circuit extending around one of the windings of sald coil.

9. In a telephone exchange system, the

erators equipment, and

latch by a coin. around one of the windings of and combination of a secondary circuit c'omprising a receiver and a secondary winding, a relay and means controlled thereby to shortcircuit the said secondary winding and shunt the said receiver, and measured serv- 1 ice means controlling said relay directly by a coin. '7

10. In atelephone exchangesystem, the combination of a secondary circuit comprising a receiver and a secondary winding, a relay, and a latch for locking the armature, of said relay, whereby'the said secondary winding-may be maintained short-circuited and the said receiver shunted, and means mechanical only, for controlling said latch by a coin. 11. In a telephone exchange system, the,

combination of a secondary circuit compris l,

ing areceiver and a secondary winding, a"

relay, a latch for locking the armature of said relay, whereby the said secondary winding may-be maintained short-circuited and the said recelver shunted, and a release relay for unlocking said armature,

and means mechanical only, for controlling said latch by a coin.

'12. In a telephone exchange system, the combination of a secondary circuit comprising a-receiver and a secondary winding, a relay, a coin controlled latch for locking the armature of said relay, whereby the said seconrlary winding may be maintained short circuit-ed and the. said receiver shunted, a

release relay for unlocking said armature, and mechanical means only whereby a suitable coin is-made to unlock said armature.

13. In a telephone exchange system, the combination of a secondary circuit comprising a receiver and a secondary winding, a relay, a latch for locking the armature of said" relay, whereby the said secondary winding maybe maintained short-circuited and the said receiver shunted, and release rclay "for unlocking said relay, and means mechanical only, for controlling said I "14. In a telephone exchange system, the combination of a central battery, a subscribers pay-station, a receiver and a second ary winding, a central office with switching machinery, adapted to be operated by cur-= rent controlled sfrom the said'pay-station, a locking relay for said pay-station, adapted to be energized at the first'electricimpulse sent to the central oflice from the paystatioin'and a latch for locking said relay, whereby the said secondary winding may be retained short-circuited and the said receiver shunted, a release relay, release circuits for restoring the central oihce switches,

one otsaid .circuits including said release relay, said latch controlled by said release relay, whereby when the central 'ofiice switches are released from the said pay- I wit the said secondary I combination of a secondary circuit compi l5.

relay, a latch inoperative,,atelephone set at the central station adapted to be connected with the calling subscribers line, a second relay at theisubstation, and means associated with said talking set for energizinf id second relay for again rendering saio. transmitter Operative.

In a telephone system, the conihination of a secondary circuit comprising a receiver and a secondary winding, a relay and means controlled thereby to short cirwinding and to shunt said receiver, and means only directly controlled by a coin and directly controlling the armature c1" Said relay. a

24. In a telephone exchange system, the

ing a receiver and a secondary "wii'nling a relay, a latch for locking, the

said relay, whereby the said ,7 econd airy winding may be maintained. shortcircuited and receiver shunted, and means mechanical only directly controlled by a coin and directly controlling said latch for re storing said relay.

25. In a telephone exchange svstenn the combination of a secondary circiu conrprising' areceiver and a secondary winding, a relay, a latch for locking the armature or". said relay, whereby the said secondary winding may be maintained short-circuited and the said receiver shunted, a release relay for unlocking said armature and means to control theoperation oi. the release relay, and purely mechanical instrui'nentalities for restoring the first relay. 26. In a telephone exchange system, the combination of a secondary circuit comprising a receiver and a secondary winding, a for locking" the armature of "said relay, whereby the said secondary .a latch for locking, the

winding only be maintained slim't-circuited and the said receiver shunted, arelease relay for unlocking said ari'natm'e and means to control the operation of the re lease relay, and ineans whereb a suitable coin is made to unlock said a "mature through the medium of purely mechanical instrumentalities.

27. In a telephone exchange system, the combination of a secondary cii' inc; a receiver and a secondary W dine, and toil con.trolled' -means comprising a, .rclayaral armature oi said secondary winding relay whereby the said maybe maintained short circuited and the 1 said receiver shunted and electromagnetic means for controllingsaid latch clectrlcally {disconnected from said toll controlled equip telephone exchange system, the

mg a receiver anda secon mechanical v sa d receiver circuit comprisary winding, and tell controlled apparatus comprising a relay, a latch for locking the armature of said relay whereby'the said secondary winding may be maintained short circu'ited and the. said receiver shunted, and a release relay for unlocking said armature, electrically' disconnected from saidftoll controlled equipment.

29, In a telephone exchange system, the coinbiimtion of a secondary circuit comprising a relay and a secondary winding, a toll controlled apparatus comprising a relay and a latch for locking the armature of said relay whereby the said. secondary winding may be maintained short circuited and the shunted, a release relay for unlocking the said ariinature, the: said toll equipment comprising means also whereby the said armature, may be unlocked by purely mechanical means.

combination of a secondar '30. In a telephone exchange system, the

,relay whereby the said secondary winding inlay be maintained short circuited and said receiver shunted, the said toll controlled equipment con'iprisino' means mechanical only directly controlled by a, coin and directly controlling the armature of said ij'elay. j

'31; In a telephone ekchange system, the combination of a secondary circuit comprising a, receiver and a secondary winding, a relay, and a latch for locking the armature of said relay, whereby the said secondary winding may be maintained short circuited and the said receiver shunted, n'lcchanical means only, for controlling said latch by a. coin, and independent electrical means for also controllimg said latch. I

In a telephone exchange system, the combination of a second.arycircui-t comprisinga receiver and a secondary Winding, a relay, a latch for locking the armature of said relay, whereby the "said secondary winding may be maintainedshort circuited and the said receiver shunted, a release relay for unlocking said armature, mechanical means only, for controlling said latch by a coin, and independent electrical means for also controlling said latch.

Signed by me at Chicago, Cook county, Illinois, this 9th day of October, 1906. v

F. H. DRURY, J. Noam. 

